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What's the story with watts?

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What's the story with watts?

Old 08-03-06, 12:02 AM
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MAK
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What's the story with watts?

Watts are supposed to measure power and effort output right?

It's about 102 degrees so I decide to go to the health club instead of becoming a statistic. I KNOW IT'S NOT THE SAME, but, I get on a stationary bike and get a decent workout and then decide to try something. I set the resistance pretty high and start pedling. I get myself up to 115-120 rpms to see what the watt output is. I am really pushing it very hard and I'm about three heartbeats from a heart attack but the watts are registering about 65. I wait a bit to recover and do the same thing on another bike and again it's only about 65. There is no way that I can compare myself to a pro but how do they do 550 watts for hours at a time going up a mountain? I had the resistance and the rpms but couldn't hit 100 watts if my life depended on it. What gives?
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Old 08-03-06, 12:14 AM
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I would guess that the machine you used is broken. (I'd really hate to assume you're that weak... ) 65 watts is really easy for anyone to do. next time, try another machine to figure out your true output during a heavy sprint
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Old 08-03-06, 12:40 AM
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He said that he tried another bike.
I don't know though...maybe the bikes suck? Or they're measured in a different way, which is still semi-unlikely.
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Old 08-03-06, 01:43 AM
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Most of the health clubs i've been to only measure heart rate at the spinners. Never heard of one that does power as well.
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Old 08-03-06, 02:19 AM
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It's not too hard to have watts on a trainer because it can be directly tied to the mag-resistance unit. The conversion-efficiency is known and you just have to measure volts & amps and multiply to get watts. Of course this method isn't practical on a road bike because it'd suck up all your power and you'd get nowhere...
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Old 08-03-06, 02:23 AM
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What's the story with watts?
There were some riots there in 1965.
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Old 08-03-06, 07:45 PM
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How to determine your watt output

Check out http://danenet.wicip.org/bcp/gearing.html

Power in watts = 0.0188*V^3,

where V is your maximum flat speed for 15 minutes with no significant wind.
eg; power = .0188 times your speed in mph cubed. You need to have a rudimentary bike computer.

Rider Flat Speed Power

Casual 17.5 100 Watts
Recreational 22.0 200 Watts
Competitive 27.7 400 Watts

I'm 78 years old, 130 lbs, 5'4" and started road biking last year. I'm a 100+ watt
rider but can make 10 % grades with a 26/36/46 triple and 13-34 cassette. I can probably increase my output by going anaerobic, but at my age that is not a good idea.

Sinchi
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Old 08-03-06, 07:49 PM
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those bikes you were on were ****ed. if lance can throw out 500 sustained watts then most anyone can at least sprint above that momentarily. i dunno if this is like football players' stats but i read somewhere that boonen can put out around 1800 in a sprint.
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Old 08-03-06, 09:22 PM
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Originally Posted by MAK
Watts are supposed to measure power and effort output right?

It's about 102 degrees so I decide to go to the health club instead of becoming a statistic. I KNOW IT'S NOT THE SAME, but, I get on a stationary bike and get a decent workout and then decide to try something. I set the resistance pretty high and start pedling. I get myself up to 115-120 rpms to see what the watt output is. I am really pushing it very hard and I'm about three heartbeats from a heart attack but the watts are registering about 65. I wait a bit to recover and do the same thing on another bike and again it's only about 65. There is no way that I can compare myself to a pro but how do they do 550 watts for hours at a time going up a mountain? I had the resistance and the rpms but couldn't hit 100 watts if my life depended on it. What gives?
With the possible exception of RPM, none of the numbers on exercise bikes mean much of anything. The mileage numbers are typically inflated, the calories numbers often drastically inflated, and I'm not really sure I trust the RPMs.
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Old 08-03-06, 09:27 PM
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Originally Posted by EURO
There were some riots there in 1965.

excellent !
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Old 08-03-06, 09:42 PM
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Originally Posted by operator
Most of the health clubs i've been to only measure heart rate at the spinners. Never heard of one that does power as well.
Just about every treadmill or stationary bike I have ever been on in a gym will read out in watts if you want it to. I never paid much attention to it. Now that I am getting back to riding, seems it is a big deal for some people.
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Old 08-03-06, 09:43 PM
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Originally Posted by SaintAndrew
i dunno if this is like football players' stats but i read somewhere that boonen can put out around 1800 in a sprint.
I'd guess more than that, though it may only be around 1800 after a long stage... I wonder how much that influences their sprint
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Old 08-04-06, 01:33 AM
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Originally Posted by ericgu
With the possible exception of RPM, none of the numbers on exercise bikes mean much of anything. The mileage numbers are typically inflated, the calories numbers often drastically inflated, and I'm not really sure I trust the RPMs.
Aw come on, surely they can't screw up a simple measurement like cadence...
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